'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')
const CompressionPlugin = require('compression-webpack-plugin')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title // 网址标题
const port = 8013 // 端口配置

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  // hash 模式下可使用
  // publicPath: process.env.NODE_ENV === 'development' ? '/' : './',
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // 启用并行处理
  parallel: require('os').cpus().length > 1,
  devServer: {
    port: port,
    open: true,
    // 热重载优化
    hot: true,
    // 启用压缩
    compress: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      '/api': {
        target: process.env.VUE_APP_BASE_API,
        changeOrigin: true,
        pathRewrite: {
          '^/api': 'api'
        }
      },
      '/auth': {
        target: process.env.VUE_APP_BASE_API,
        changeOrigin: true,
        pathRewrite: {
          '^/auth': 'auth'
        }
      },
      '/information': {
        target: process.env.VUE_APP_BASE_API,
        changeOrigin: true,
        pathRewrite: {
          '^/information': 'information'
        }
      },
      '/tel': {
        target: process.env.VUE_APP_BASE_API,
        changeOrigin: true,
        pathRewrite: {
          '^/tel': 'tel'
        }
      }
    }
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src'),
        '@crud': resolve('src/components/Crud')
      }
    },
    plugins: [
      // gzip压缩优化
      new CompressionPlugin({
        test: /\.(js|css|html|svg)$/i,
        filename: '[path][base].gz',
        algorithm: 'gzip',
        threshold: 10240, // 只压缩超过10kb的文件
        minRatio: 0.8,
        deleteOriginalAssets: false
      })
    ]
  },
  chainWebpack(config) {
    // 移除预加载提升首屏加载
    config.plugins.delete('preload')
    config.plugins.delete('prefetch')

    // 开发环境sourcemap优化
    if (process.env.NODE_ENV === 'development') {
      config.devtool('eval-cheap-module-source-map')
    }

    // 生产环境资源优化
    if (process.env.NODE_ENV === 'production') {
      // 压缩图片
      config.module
        .rule('images')
        .use('image-webpack-loader')
        .loader('image-webpack-loader')
        .options({
          mozjpeg: { progressive: true, quality: 65 },
          optipng: { enabled: false },
          pngquant: { quality: [0.65, 0.90], speed: 4 },
          gifsicle: { interlaced: false },
          webp: { quality: 75 }
        })
    }

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    // set preserveWhitespace
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
      // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI',
                  priority: 20,
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/
                },
                echarts: {
                  name: 'chunk-echarts',
                  priority: 20,
                  test: /[\\/]node_modules[\\/]_?echarts(.*)/
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'),
                  minChunks: 3,
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  },
  transpileDependencies: [
    'vue-echarts',
    'resize-detector'
  ]
}
